An optical disk recording thereon compressed moving picture data and an optical disk reproduction apparatus each capable of easily effecting trick play such as high speed reproduction and a retrieval operation at a high speed. Additional information necessary for trick play is recorded in an arbitrary area of an optical disk such as a TOC (Table of Contents) or a leading sector (sector 0) of the disk, and a sector address is added to each sector. To conduct trick play, an I picture, a P picture and a B picture contained in a GOP layer inside a bit stream of compressed image data are extracted and reproduced in accordance with a reproduction speed by looking up a trick play table.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An optical disk recording thereon main information including a plurality of sectors having sector addresses, respectively wherein: said main information includes image data compressed with a variable transfer rate; said optical disk has a plurality of tables for trick play containing at least a table representative of a relationship between said sector addresses and time information of the compressed image data, and a table representative of a relationship between a picture of said compressed image data and said sector addresses; and a required image data can be selectively reproduced by looking up the sector addresses in the tables for trick play.
2. An optical disk according to claim 1 , wherein: said optical disk records thereon an identification code for distinguishing the tables for trick play; and said identification code identifies a required table for trick play so that a required image data can be selectively reproduced by looking up the sector addresses in the identified table for trick play.
3. An optical disk reproduction apparatus for reproducing image data recorded on an optical disk wherein: said optical disk records said image data formed by a plurality of sectors each of which has a sector address; said image data is compressed with a variable transfer rate; said optical disk further includes a plurality of tables for trick play containing at least a table representative of relationship between said sector addresses and time information of the compressed image data, and a table representative of a relationship between a picture of said compressed image data and said sector addresses; and said apparatus includes; means for detecting a sector address for reproducing a required image data by looking up said tables for trick play; and means for retrieving the detected sector address on the optical disk to reproduce the required image data.
4. An optical disk reproduction apparatus according to claim 3 , wherein: said optical disk has an identification code for indentifying said tables for trick play; said apparatus further includes means for indentifying a required table for trick play on the basis of said indentification code; and a sector address for reproducing a required image data is detected in said identified table for trick play by means for detecting said sector address to reproduce said required image data.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 29, 2001
June 11, 2002
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